# mill scale

> English word · Noun

## Definitions
1. The flaky surface of hot rolled steel, which will protect the steel against atmospheric corrosion until it is removed or flakes off. The scale should be removed before paint is applied.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/mill-scale